"So, yes, they are going to do a little better than McCain did, and we may not do as well as we did in 2008, but we're doing plenty well - and well enough to win this race," he said.
The Associated Press reports that thousands of people waited for hours in long lines during the last weekend of early voting in Ohio.
At some sites Sunday, lines snaked for several city blocks and it took hours to cast a ballot. In Cleveland, more than 2,500 people braved the cold in a line that stretched two blocks on Sunday afternoon.
In Akron, voters waited an average of two hours to vote Sunday. In Columbus, 15,000 people waited in line for as long as two hours from Friday through Sunday to cast early ballots in a state that could decide the presidential election.
In Cincinnati, several thousand voters waited for as long as four hours in sometimes-rainy chilly weather.
About 1.6 million people have voted early in Ohio.
In Indiana, residents have only a few more hours to cast early ballots for this year's hotly contested presidential, Senate, governor's and other races.
Voters can cast early in-person ballots for Tuesday's election until noon Monday at county courthouses and other locations around the state.